the vss teeth gear needs to be changed physically on the rear of the trans to correct your cluster speedo.

VSBART_RT is vehicle speed reverse calculated from the oss teeth count that the ecu uses to shift. Depending on what year trans you got you may need to update the OSS Teeth count in the tune and dial in nvbase to get VSBART_RT to be accurate. The trans write up has all the details.

Yep you can. For all TunerPro multi bank tunes you have to save the entire image 0 to 3ffff same as a 4 bank. Details are in the getting started write up.